ML051460287

E-mail Updated Millstone Event Notice # 41607: 04/17/2005

ML051460287
Person / Time
Site:	Millstone
Issue date:	04/17/2005
From:	NRC Region 1
To:	Mcginty T, Jason White Office of Nuclear Material Safety and Safeguards
References
FOIA/PA-2005-0207
Download: ML051460287 (4)

Text

THeadquarters Operations Officer 1 - Updated Millstone Event Notce # 41607: 04/17/2005 .I.I................ .I.

I... ........

......., F.,,Pae.l From: Headquarters Operations Officer 1 To: Ircl; John White; Tim McGinty Date: 4/17/05 2:28PM

Subject:

Updated Millstone Event Notice # 41607: 04/17/2005 Draft attached Headquarters Operations Officer U.S. Nuclear Regulatory Commission Phone: (301) 816-5100 Fax: (301) 816-5151 E-mail: HO0 @nrc.gov VI

!!! This is aU.S.draft document, do not release to the public !!! Pa-e I 04/17/2005 NuclearRegulatory Commission OperationsCenater Event Report Power Reactor Event# 41607 Site: MILLSTONE Notification Date I Time: 04/17/2005 09:24 (EDT)

Unit: 3 Region: 1 State: CT Event Date I Time: 04/17/2005 08:29 (EDT)

Reactor Type: [1] GE-3,[2] CE,[3] W-4-LP Last Modification: 04/17/2005 Containment Type: MARK I DRY AMB DRY SUB NRC Notified by: MICHAEL GOBELI Notifications: SAM COLLINS RA HQ Ops Officer: JOHN KNOKE TIM MCGINTY IRD Emergency Class: ALERT JIM DYER ET 10 CFR Section: R1 BLAST DIAL 50.72(a) (1) (i) EMERGENCY DECLARED E. BRENNER PAO 50.72(b)(2)(iv)(A) ECCS INJECTION 50.72(b)(2)(iv)(B) RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) VALID SPECIF SYS ACTUATION Unit I Scram Code I Crit Init Power Initial RX Mode Curr Power I Current RX Mode 3 A/R Yes 100 Power Operation 0 Hot Standby ALERT Df qltEnjpsf 0OCHI li3 &L"IfletE&6171&Vfl- BWTJgGffiflefVATlON At 08:29 the licensee indicated several main steam relief valves lifted and stayed open. A low pressure signal from the secondary steam generator caused the Unit 3 reactor to trip. All rods fully inserted as required.

Activation of the RPS initiated safety injection which caused the pressurizer to go solid. The primary reactor coolant system and secondary main steam system have been stabilized and pressurizer level and pressure are within normal set points. At 09:35 licensee reported all safety relief valves have reseated. Decay heat is being directed to the atmospheric dumps due to the main condenser not being available. The licensee is attempting to establish ERDS.

Initial assessment of this incident is believed not to be security related, however, follow-up is being conducted to verity same. At 09:48 the NRC management made a decision to enter into Monitoring. At about 11:15 the licensee indicated a valve was leaking in the charging system so it was isolated. Licensee stated there were no radiological releases and no indication of S/G tube leakage.

Licensee notified State and will notify the NRC Resident Inspector. Notified DHS (Doyle), FEMA (Biscue), DOE (Smith), USDA (Magners), and HHS (Hogan).

• UPDATE FROM D. DODSON TO W. GOTT 1328 EDT 04/17/05 ***

"At approximately 0830 on April 17, 2005 Millstone Unit 3 experienced an automatic reactor trip from full power.

The Reactor is in a stable shutdown condition and is proceeding to Mode 5 cold shutdown. No release of radioactivity other than those minor releases associated with normal plant operation has occurred. There were no personnel injuries associated with the event.

"In addition to the Reactor Trip, half-train Safety Injection (SI) and half-train Main Steam Isolation (MSI) actuations occurred. Control room personnel were successful at manually initiating full SI and MSI. Si has since been terminated and RCS pressure control has been restored. Multiple steam line safety valves (MSSV) lifted with at

!!! This is a draft document, do not release to the public !!!

0__17_2005 U.S. Nuclear Regulatory Commission Operations CenterEvent Report Pare2 Power Reactor Event# 41607 least one MSSV indicating a failure to reclose. As a result, an ALERT was declared at approximately 0853 due to the failure of at least one MSSV failing to reclose. All MSSV's are currently closed. Auxiliary Feedwater (AFW) actuated automatically as expected, however; the turbine driven auxiliary feedwater pump (TDAFWP) tripped on start-up and was subsequently reset locally. Both motor driven auxiliary feedwater pumps (MDAFWPs) operated as expected to maintain steam generator water levels. Due to the additional inventory injected to the Reactor Coolant System (RCS) as a result of the Si actuation, the pressurizer filled and a primary system safety valve (PSSV) actuated at a lower than expected pressure. All PSSV's are currently closed, however, there is indication of leakage past either a PSSV or Pilot Operated Relief Valve (PORV). Upon alignment of the Charging system to Refueling Water Storage Tank recirculation flow path, 2 valves had indication of packing leakage. Those packing leaks have been terminated.

"The cause of the event is under investigation.

The licensee has issued a press release. The licensee will notify the NRC Resident Inspector. Notified R1 DO (J.

White) and IRD Manager (T. McGinty)

- e. 'b U.S. NuclearRegulatory Commission OperationsCenter

• • • Event Summary ***

!!! This is a draft document, do not release to the public !!!

41607 MILLSTONE ALERT This Event has been updated III 50.72(a) (1) (I) EMERGENCY DECLARED 50.72(b)(2)(iv)(A) ECCS INJECTION 50.72(b)(2)(iv)(B) RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) VALID SPECIF SYS ACTUATION Page 1 of)

April17, Sunday, April 2005 17, 2005 PageI of I